Scientists in Germany have discovered that microscopic plastic particles now make up a measurable portion of urban air pollution, raising fresh concerns about long-term health risks linked to breathing polluted city air.
A new study conducted in Leipzig found that nearly 4 per cent of airborne particulate matter consists of microplastics, with tire wear emerging as the single largest source of contamination. Researchers warned that the findings highlight an overlooked form of pollution that may eventually reshape global air quality regulations.
The study, carried out by researchers from the Leibniz Institute for Tropospheric Research and Carl von Ossietzky University of Oldenburg, was published in Communications Earth & Environment.
Scientists estimated that a person living in heavily trafficked urban areas such as Leipzig could inhale around 2.1 micrograms of plastic particles every day. Based on existing health models, this exposure may be linked to a 9 per cent higher risk of cardiovascular disease-related deaths and a 13 per cent increased risk of lung cancer mortality.
Researchers explained that around 65 per cent of the detected airborne plastic particles came from tire abrasion caused by vehicles moving along busy roads. Other major contributors included plastics such as polyvinyl chloride, polyethylene and polyethylene terephthalate, materials commonly used in packaging, pipes and bottles.
To conduct the study, scientists collected fine particulate matter samples from a major traffic corridor in Leipzig over two weeks. Using advanced chemical analysis techniques, they identified and measured various plastic polymers present in the air.
Experts noted that airborne microplastics and nanoplastics have increasingly been detected even in remote regions such as polar areas and mountain ranges, suggesting plastic pollution has become a truly global atmospheric issue.
Researchers warned that extremely small nanoplastic particles can travel deep into human lungs, potentially triggering inflammation, oxidative stress and respiratory illness. Scientists also noted that these particles may carry toxic substances such as heavy metals and harmful hydrocarbons on their surfaces, increasing their potential health impacts.
Despite growing evidence, neither the World Health Organization nor the European Union currently has official limits or air quality standards for microplastic pollution.
The findings also challenge assumptions that electric vehicles alone will solve urban air pollution problems. Researchers stressed that while electric mobility may reduce exhaust emissions, tire abrasion would continue generating large amounts of airborne plastic particles unless stricter regulations and improved tire technologies are introduced.
Scientists are now calling for long-term studies to better understand the toxicity of different plastic particles, establish safe exposure limits and develop international monitoring standards for airborne microplastics.
The research team said microplastics should now be treated as an emerging category of air pollutant alongside traditional particulate matter, especially as urban populations continue facing rising exposure to polluted air.